| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.mina.transport.socket.apr; |
| |
| import org.apache.tomcat.jni.Library; |
| import org.apache.tomcat.jni.Pool; |
| |
| /** |
| * Internal singleton used for initializing correctly the APR native library |
| * and the associated root memory pool. |
| * |
| * It'll finalize nicely the native resources (libraries and memory pools). |
| * |
| * Each memory pool used in the APR transport module needs to be children of the |
| * root pool AprLibrary#getRootPool(). |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| class AprLibrary { |
| |
| // is APR library was initialized (load of native libraries) |
| private static AprLibrary library = null; |
| |
| /** |
| * get the shared instance of APR library, if none, initialize one |
| * @return the current APR library singleton |
| */ |
| static synchronized AprLibrary getInstance() { |
| if (!isInitialized()) |
| initialize(); |
| return library; |
| } |
| |
| /** |
| * initialize the APR Library by loading the associated native libraries |
| * and creating the associated singleton |
| */ |
| private static synchronized void initialize() { |
| if (library == null) |
| library = new AprLibrary(); |
| } |
| |
| /** |
| * is the APR library was initialized. |
| * @return true if the Library is initialized, false otherwise |
| */ |
| static synchronized boolean isInitialized() { |
| return library != null; |
| } |
| |
| // APR memory pool (package wide mother pool) |
| private final long pool; |
| |
| /** |
| * APR library singleton constructor. Called only when accessing the |
| * singleton the first time. |
| * It's initializing an APR memory pool for the whole package (a.k.a mother or root pool). |
| */ |
| private AprLibrary() { |
| try { |
| Library.initialize(null); |
| } catch (Throwable t) { |
| throw new RuntimeException("Error loading Apache Portable Runtime (APR).", t); |
| } |
| pool = Pool.create(0); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| super.finalize(); |
| Pool.destroy(pool); |
| } |
| |
| /** |
| * get the package wide root pool, the mother of all the pool created |
| * in APR transport module. |
| * @return number identifying the root pool |
| */ |
| long getRootPool() { |
| return pool; |
| } |
| } |